In some test setups/test systems for low power devices it is desirable to have as little impact on current consumption as possible by the test setup itself. For test systems this is achieved by separating the IOs physically (relays, opto-couplers (bad for signal integrity), ...) to get rid of or (at least) minimize current flow across IOs and its protection circuitry.
A simple approach to keep cross supply (and sinking) via IOs low is to track VDD of the device under test and adjust VIO according to the measured VDD. (I use this by tracking the analog voltage with an analog discovery and setting VIO of the digital discoveries).
However, it would be very nice if the Digital Discoveries could support a “VIO sense” input to define/set VIO (port wise) and replace this (software based) approach by hardware to guarantee least voltage offset (between VDD of the Device Under Test and VIO of the Digital Discovery), tracking response (regarding time) and in general saving system resources.
Did you ever plan to implement such a feature in upcoming versions of the D³s devices?
Question
DigilentFan
In some test setups/test systems for low power devices it is desirable to have as little impact on current consumption as possible by the test setup itself. For test systems this is achieved by separating the IOs physically (relays, opto-couplers (bad for signal integrity), ...) to get rid of or (at least) minimize current flow across IOs and its protection circuitry.
A simple approach to keep cross supply (and sinking) via IOs low is to track VDD of the device under test and adjust VIO according to the measured VDD. (I use this by tracking the analog voltage with an analog discovery and setting VIO of the digital discoveries).
However, it would be very nice if the Digital Discoveries could support a “VIO sense” input to define/set VIO (port wise) and replace this (software based) approach by hardware to guarantee least voltage offset (between VDD of the Device Under Test and VIO of the Digital Discovery), tracking response (regarding time) and in general saving system resources.
Did you ever plan to implement such a feature in upcoming versions of the D³s devices?
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